Merge pull request #4118 from fkohrt/patch-1

Fix typos

Author: sidharthv96

packages/mermaid/src/docs/syntax/flowchart.md

@@ -245,9 +245,9 @@ flowchart LR
    A == text ==> B
 ```
 
-### An invisisble link
+### An invisible link
 
-This can be a usefull tool in some instances where you want to alter the default positining of a node.
+This can be a useful tool in some instances where you want to alter the default positining of a node.
 
 ```mermaid-example
 flowchart LR